Michael Marcin wrote:
Phil Endecott wrote:
Ion Gazta?aga wrote:
Since there is no atomic operations library in Boost I use my own atomic operations (taken from apache):
http://svn.boost.org/svn/boost/trunk/boost/interprocess/detail/atomic.hpp
It would be great to make this a publicly-visible library, rather than an implementation detail of interprocess. That would avoid duplication of effort in e.g. shared_ptr.
Note that recent-ish versions of gcc have builtins for atomic operations on many platforms.
Have you seen Matt Calabrese's work?
No I hadn't seen that; thanks for pointing it out. While trying to find the 'asm', or whatever it uses, I must say that I have never seen quite so many levels of #includes! I have spent a while looking but I can't find what's actually at the bottom of it all... Based on my recent experience of adding ARM asm to shared_ptr, all that I would want from an Atomics library is something that wraps the gcc builtins when they exist, otherwise falling back to something like Ion's existing apache-based code - with some macros or other indication of whether the implementation for each function is asm or a more expensive emulation. There may well be applications for a library like Matt's, but I would prefer it to be implemented on top of a more primitive, but accessible, layer. Regards, Phil.